Answer:
192 degrees
Explanation:
The explanation is really simple. As you should know, the degree measure of a circle is 360 degrees such that the m∠x + the m∠y can be computed as such:
360 - 104 - 64 = m∠x + m∠y
256 - 64 = m∠x + m∠y
m∠x + m∠y = 192 degrees